For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

A

Same

B

Less

C

Greater

D

None of these

Log mean temperature difference in case of counter flow compared to parallel flow will be

A

Same

B

More

C

Less

D

Depends on other factors

In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

A

Is always less than arithmetic average value

B

Is always more than arithmetic mean value and the geometric mean value

C

Is always less than arithmetic mean value, but more than geometric mean value

D

May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current

In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

A

Minimum

B

Maximum

C

Zero

D

Infinity

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

A

[

A.

B. > 1

B

1

C

∞

Most air cooled condensers are designed to operate with a temperature difference of

A

5°C

B

8°C

C

14°C

D

22°C

LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

A

Higher

B

Lower

C

Same

D

Depends on the area of heat exchanger

In counter flow compared to parallel flow,

A

LMTD is greater

B

Less surface area is required for a given heat transfer rate

C

Both A and B

D

More surface area is required for a given heat transfer rate

For লুপ এর গুরুত্বপূর্ণ অংশ- i. Counter initialization ii. Condition iii. Counter update নিচের কোনটি সঠিক?

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

For লুপ এর গুরুত্বপূর্ণ অংশ-i. Counter initialization ii. Condition iii. Counter update নিচের কোনটি সঠিক?

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

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